FSZ 2373 | page 7 of 38 2 Description of specimen 2.1 General The specimen comprised a nominal 3000-mm wide x 2650-mm high x 100-mm thick external panel wall system, mounted on top of a 350-mm high non-combustible sill. Wall Panels The external wall system comprised 100-mm thick DeltaCool insulated panels. The panels consisted of thermosetting phenolic core (TPC) with a stated density of 38-42 kg/m3. The core was bonded on both sides to 0.6-mm thick roll formed steel skins using two-part polyurethane adhesive. Wall construction The wall specimen was constructed in accordance with the requirements stipulated in Section 15 of the AS1530.8.1-2018 test standard. The wall incorporated a rebate at the centre, with an internal and an external corner detail on each side of the rebate. The centre part of the wall included a window, with an eaves detail above it. The wall was constructed on top of a non-combustible sill with a representative wall to ground detail, as shown in drawings TPC-T001, sheets 1-4, dated 22 March 2023. The wall corners were formed using 45-degree mitre joints, with the panels sealed with Soudal Firecryl FR sealant. The centre section of the wall included two panel joints, as it was constructed using three panels, one central 1200-wide panel and two 400-mm wide panels. The wall panels were joined together using slip joint design, and then sealed flush using Boss FireSilicone-EMA sealant. All other joints including corner joints, panel edges and window surrounds were covered using steel corner and channel flashings fixed with steel rivets at 300-mm. All the flashings would then be sealed with a bead of Boss FireSilicone-EMA sealant. Window A Bradnam’s “Essential” Series fixed window was installed in the central section of the wall specimen, approximately 500-mm off the bottom sill. The window incorporated clear 5-mm thick toughened glass framed in an 800-mm x 800-mm steel frame and was constructed in accordance with prescribed solution specified in AS 3959 for BAL 29. The window was face mounted on the fire exposed face of the wall into a close-fitting aperture cut out in the central wall panel, and restrained using steel angles and window flashings, as shown in drawing TPC-T001, sheet 3, dated 22 March 2023, and photograph 3 of Appendix B. The window flashings were fixed with steel rivets at 300-mm centres and sealed to the wall panels using Boss FireSilicone-EMA sealant. Eaves An eave detail was installed along the top of the rebate of the wall. The eave detail was constructed in accordance with prescribed solution specified in AS 3959 for BAL 29. It included a 250-mm x 250- mm metal framed boxed section lined on the front and the underside with 6-mm fibre cement sheeting. All the external corners of the eave framing were covered with corner flashings and sealed with Boss FireSilicone-EMA sealant.
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